Don't report a keepalive count for persistent pages.

extensions/browser/process_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/process_manager.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 454 matching lines @@
 const Extension* ProcessManager::GetExtensionForWebContents(
     const content::WebContents* web_contents) {
   if (!web_contents->GetSiteInstance())
     return nullptr;
   return extension_registry_->enabled_extensions().GetByID(
       GetExtensionIdForSiteInstance(web_contents->GetSiteInstance()));
 }
 
 int ProcessManager::GetLazyKeepaliveCount(const Extension* extension) {
   if (!BackgroundInfo::HasLazyBackgroundPage(extension))
-    return 0;
+    return -1;
 
   return background_page_data_[extension->id()].lazy_keepalive_count;
 }
 
 void ProcessManager::IncrementLazyKeepaliveCount(const Extension* extension) {
   if (BackgroundInfo::HasLazyBackgroundPage(extension)) {
     int& count = background_page_data_[extension->id()].lazy_keepalive_count;
     if (++count == 1)
       OnLazyBackgroundPageActive(extension->id());
   }
@@ skipping 504 matching lines @@
   if (extension && !IncognitoInfo::IsSplitMode(extension)) {
     BrowserContext* original_context =
         ExtensionsBrowserClient::Get()->GetOriginalContext(browser_context());
     return ProcessManager::Get(original_context)->GetSiteInstanceForURL(url);
   }
 
   return ProcessManager::GetSiteInstanceForURL(url);
 }
 
 }  // namespace extensions